<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const arr1 = [];
      const arr2 = [];
      const arr3 = [];
      // const arr = new Array()
      // Array.prototype.join;
      console.log(arr1.join);
      console.log(arr2.join);
      console.log(arr3.join);
    </script>
  </body>
</html>
